英文别名6-Keto Levonorgestrel; 6-Oxo Norgestrel; (8R,9S,10R,13S,14S,17R)-13-ethyl-17-ethynyl-17-hydroxy-2,7,8,9,10,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene-3,6-dione; (17α)-13-Ethyl-17-hydroxy-18,19-dinorpregn-4-en-20-yne-3,6-dione; Levonorgestrel Impurity J; 6-Oxolevonorgestrel; 13-Ethyl-17-hydroxy-18,19-dinor-17alpha-pregn-4-en-20-yne-3,6-dione 
